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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eda9376e8526806611f8986102fdc25b2136b36fc4578fc0d51d59d41914055' 
  AND token = 'aqXK7U2m0yYk0C6PRzG1UjKHI/ueTjpb4pN4yfytyac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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