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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b32be87f2b816e1162f3b81e20e2a62c5952499ae38d2dcc66296b0a0177676' 
  AND token = 'JXbW5UH03+QT2oiDMb8PplDXrqLVknRjNmXhF7Q+O8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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