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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a276975b33217131bb1e01deb98bf353eef55f6c14318538d3a62c6f17c4ad6' 
  AND token = 'iW6k7QvGQUcirBXjQCNUptSLV5V2tdLQSSTjnOzBgSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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