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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f72fc1f115c8774c25bb0f9630adea5e62caa3eea3750e18f86b2f7775ffc00' 
  AND token = 'BoVsJ7z7nF4vF2syYlYtN0afr/l/kJSlWU2095BiEAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}