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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fa4d373df5c140ad9c0654e2416663c3235c27dc9d5c71b18f2309775c80da' 
  AND token = 'kCLP2anr9y8auldcCrp3SQgayTUD+jv685dWTeKCFaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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