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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69174c11deeda0b70bf37bd3315bc31c1117ed765faeaa8728796c21ba2379b' 
  AND token = 'F+LWxSAi+RXfKWk3om6tkGFbGJWUxQ5G3/zC8CFzVJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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