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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d8381fcb11df6714f7be8a40b5748d96a521192765ce7f20fd122f34a21f44' 
  AND token = '7W/oSTxa5GTTX3ywLXK1SbZVi2CG1CcUFWLtljrJabQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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